From A Student's Perspective: Assignment Manager

Students can submit assignments electronically using the Assignment Manager.
Submitted assignments can then be reviewed and graded by the Instructor.
Gradebook entries are automatically created and posted after an assignment
has been reviewed.

Students access the Assignment Manager by selecting
the content area in which the assignment was posted.

To complete an assignment, a student selects the
View/Complete Assignment link.

Student View: View/Complete Assignment page

A student attaches his/her completed assignment(s) and adds any comments for the Instructor. He/she then submits the assignment.
After the assignment has been reviewed by the instructor/TA and graded, a student can access the assignment again to see his/her grade. He/she can also access this information through My Grades.

Assignments can only be submitted once, but students can still access the assignment to review their grades and submitted files.